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spapr: don't advertise radix GTSE if max-compat-cpu < power9 

On a POWER9 host, if a guest runs in pre POWER9 compat mode, it necessarily
uses the hash MMU mode. In this case, we shouldn't advertise radix GTSE in
the ibm,arch-vec-5-platform-support DT property as the current code does.
The first reason is that it doesn't make sense, and the second one is that
causes the CAS-negotiated options subsection to be migrated. This breaks
backward migration to QEMU 2.7 and older versions on POWER8 hosts:

qemu-system-ppc64: error while loading state for instance 0x0 of device
 'spapr'
qemu-system-ppc64: load of migration failed: No such file or directory

This patch hence initialize CPUs a bit earlier so that we can check the
requested compat mode, and don't set OV5_MMU_RADIX_GTSE for power8 and
older.

Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2018-05-03 23:16:59 +02:00 committed by David Gibson
parent aef19c04bf
commit 0550b1206a
1 changed files with 10 additions and 5 deletions
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15
hw/ppc/spapr.c
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@ -2512,6 +2512,7 @@ static void spapr_machine_init(MachineState *machine)
long load_limit, fw_size;
char *filename;
Error *resize_hpt_err = NULL;
PowerPCCPU *first_ppc_cpu;
msi_nonbroken = true;
@ -2592,11 +2593,6 @@ static void spapr_machine_init(MachineState *machine)
}
spapr_ovec_set(spapr->ov5, OV5_FORM1_AFFINITY);
if (!kvm_enabled() || kvmppc_has_cap_mmu_radix()) {
/* KVM and TCG always allow GTSE with radix... */
spapr_ovec_set(spapr->ov5, OV5_MMU_RADIX_GTSE);
}
/* ... but not with hash (currently). */
/* advertise support for dedicated HP event source to guests */
if (spapr->use_hotplug_event_source) {
@ -2614,6 +2610,15 @@ static void spapr_machine_init(MachineState *machine)
/* init CPUs */
spapr_init_cpus(spapr);
first_ppc_cpu = POWERPC_CPU(first_cpu);
if ((!kvm_enabled() || kvmppc_has_cap_mmu_radix()) &&
ppc_check_compat(first_ppc_cpu, CPU_POWERPC_LOGICAL_3_00, 0,
spapr->max_compat_pvr)) {
/* KVM and TCG always allow GTSE with radix... */
spapr_ovec_set(spapr->ov5, OV5_MMU_RADIX_GTSE);
}
/* ... but not with hash (currently). */
if (kvm_enabled()) {
/* Enable H_LOGICAL_CI_* so SLOF can talk to in-kernel devices */
kvmppc_enable_logical_ci_hcalls();